Drill-jig.



G. 0. GAIN, J'E.

. DRILL JIG- APPLIOATION IILED NOV. 8, 1907.

Patented Dec. 29, 1908.

as if;

WITNESSES: I

V4 in:

ATTORNE spaced holes formed in the disk within the mirrnn STATES PATENTOFFICE.

CHARLES 0. GAIN, JR., OF NEW YORK, N. Y., ASS NEW YORK, N. Y.

DRILL-JIG.

GNOR TO CHARLES GIBBS, OF

No. 907,735. Specification of Letters Patent. Patented Dec. 29, 1908.

Application filed November 8, 1907. Serial No. 401,226.

To all whom-it may concern:

Be it known that I, CHARLES 0. GAIN, Jr., a citizen of the UnitedStates, residing in borough of Brooklyn, city of New York, in the countyof Kings and State of New York, have invented certain new and usefulImprovements in Drill-Jigs, of which the followlngris a specification.

his invention relates to a jig or appliance for facilitating theoperation of drilling shafts, studs and analogous articles.

The object of the invention is to provide simple and inexpensive meansfor enabling a hole of any desired size to be drilled transversely in ashaft, stud or like article.

In carrying out my invention, I form a V- groove in a block to receivethe shaft to be drilled, and I mount upon said block a disk havingaround its border a succession of drill guiding holes of graduateddiameters, any one of which may be brought into line with the center ofthe shaft to be drilled, the disk length to accommodate the verticaladjustments of the disk.

In the accompanying drawings, Figure 1 is a plan of a drill-jig embInents. Fig. 2 is a side elevation of the same. Fig. 3 is a plan of theblock. Fig. 4

is an end elevation of the jig, showing a drill 1 guide in the disk andpenetrating the work.

Fig. 5 is a sectional elevation illustrating the manner of mounting thedisk.

. In a block 1 of metal is cut a V-groove 2 to receive the shaft orother work 3 which is to be drilled. Any other form of work holder orsupport may be usedin place of the V- groove, within the scope of theinvention.

or border a circular series 5 of drill holes of graduated sizes, ispivotally mounted upon the block, the disk or pivot-hole 6 to fit upon acylindrical neck 7 of a collar 8, which is threaded or otherwise securedupon a shank 9 of a screw, the latter being revolubly mounted for thispurpose. haylng a linger-piece or head 10. The collar I provide meansfor indexing the disk, to in- 8 fits snugly in a vertical pivot hole 11formed sure accuracy in positioning the drill guiding in the center ofthe block, and the projecting hole centrally of the shaft or of theV-groove which holds the shaft, and I also provide means for clampingthe disk down upon the shaft or work.

In the preferred manner of practicing the invention, grooves are formedupon opposite sides of the block, and the disk overhangs threaded lowerend of the screw 9-is threaded into a central hole 12 extending throughthe block below'the depression 11. The disk 4 is loosely confinedbetween a shoulder 13 formed upon the upper end of the collar, and aflange 14 formed on the screw.

In the block is formed, at a point remote both grooves, so that it maybe used in confrom the groove 2, a deep vertical hole or nection witheither of them. These grooves seat 15 to receive a positioning or indexpin are of different capacities, to suit either small 16, passing downthrough the disk and havwork or large work. A third groove, which ing ahead 17 above the same. Said pin 16 is distinguished from the others inbeing ramay pass through any of a circular series of dial instead oftangential, may be formed holes 18 formed at equal angular intervalshalf way between the other grooves to extend from the edge of the blocktowards the axis about which the disk revolves. This third grooveaccommodates the shanks of screws or other headed articles. A singleindexing device positions the disk to cooperate with all three grooves.The indexing device preferably comprises a circular series of evenly inthe disk within the circular series of drill guiding holes 5. It will beunderstood that when the pin 16 registers one of the holes 18 with thehole 15, the corresponding drill guiding hole 5 occupies the properposition for guiding a drill to the center of a cylindrical shaft-3placed in the work holder 2.

In operation the thumb piece 10 may be turned to unscrew and screw 9 andraise the disk 4, the latter being moved by the shoulder 13, whichraises with its screw. Then shaft or other work 3 is placed in thegroove 2, and the disk 4 is ro circle of drill guiding holes, and asingle vertical pin which may be passed down through any of the indexholes into adeep hole or seat odying my improve- A horizontal disk 4,having around its ed e having a central aperture.

site edge of the block 2 is formed a second.

V-groove parallel with the groove 2, but of much greater width-or muchlarger capacity, to accommodate larger shafts. It will be seen that anyof the drill guiding holes 5 may be brought to the central line of thegroove 20,- and that the operation is similar to that already describedwith reference to 'cular series of drill holes 5.

the groove 2. V

In one end of the block may be formed a short groove 21, this groovebeing radial or extending from the edge of the block to the axis aboutwhich the disk 4 revolves; the grooves 2 and 20 being tangential to thecir This short groove 21 will accommodate the shank 22 of a headed screwor other headed device, and any of the drill guiding holes 5 may bebrought into register with the central line of the groove 21. The singleindex pin 16 serves to position the disk for drilling work placed in anyone of the three grooves. Preferably the mdex holes 18 are placed atintervals of about nine degrees, and are forty in number; the drillguiding holes 5 being laced in the same manner. lhe pivot of the arbor 4being half way between the centers of the grooves 2 and 20, and thecentral line of the parallel groove 21 assing through the center of saidivot, it to ows that when any drill guiding ole is in register witheither of the three grooves, two other drill guiding holes are inregister with the other two grooves; the central .lines of the outergrooves touching the circular drill iding holes at opposite points, eachof WlllOll is separated by ninety ees from the center hne of the'groove21. If desired, the indexing holes may be numbered, as illustrated atFig. 1, for convenience in adjusting the disk.

Variations may be resorted to within the scope of the invention, andportions of the imlpIrovements may be used without others.

aving thus described my invention, I claim:

1. The combination with a block provided with a v-groove to position thework, of a drill guide in the form of a disk revolubly 'mounted uponsaid block with its edge portion overhanging said groove, and having insaid edge portion a circular series of holes to guide thedrills to thework, and means 3. The combination with 'a block provided with av-groove to position the work, of a drill guide in the form of a diskwhose edge overhangs said groove andcontains a series 'of drill guidingholes, and an arbor having means whereby it may be rotated; said arborcomprising a stem ortion threaded at its lower end into the b ock; andalso havin a head to clamp the disk down, and a co ar below said diskconnected to said shank to lift the disk.

4. The combination with a block provided with a v-groove to position thework, of a drill guidein the form of a disk whose edge overhangs saidgroove and contains a series of drill guiding holes, and an arbor havingmeans whereby it may be rotated and also having a head to clamp the diskdown, and having a collar below said disk to lift the disk, said collarfittin in a cylindrical hole or depression in the %lock, andsaid arborhaving a threaded end projecting down from said collar and threaded intosaid block below said depression.

5. The combination with a block, of a drill guide in the form of a diskrevolubly mounted upon said block and rovided with a series of drillguidin ho es, a V-groove to position the work eing provided in saidlookand extending tangentially of said circular series, a-second V- oovebeing also providedin said block an extending from the edge thereoftowards the axis of said disk, and a single indexing means forpositioning said disk relatively to both of said grooves.

6. The combination with a block provided with a plurality of V-groovesof different capacities to positionthe Work, of a drill guide in theform of a disk revolubly mounted upon said block with its edge portionoveroverhanging said grooves and having drill guiding holes in said edgeportion; said seat being positioned to enable the index pin grooves beinlocated at opposite sides of to position the disk for cooperation withall 0- the block an said disk being mounted beof said grooves.

tween said grooves, index holes being formed 5 at uniform intervalsaround the disk to correspond to the drill guiding holes, and a sin-Witnesses:

gle index pin to fit said index holes and hav- CHARLES GIBBS,

ing a seat in the block; the holes and the WILLIAM W. LASKER.

CHARLES "0. GAIN, JR.

